Reversing turbine.



H. T. HERE.

REVERSING TURBINE.

APPLICATION FILED JULY 23, 1910.

'Patentd Mar. 25, 1913.

Mll lll llm n Ill WITNES INVENTOR. 7

NM 3 0w 1 BY m M I HIS ATTORNEY IN FACT.

' UNITED STATES PATENT orat on.

HERBERT T. HERE, 0! PITTSBURGH, PENNSYLVANIA, ASSIGNOR, IBY MESNE ASSIGN- MENTS, TO THE COLONIAL TRUST COMPANY, TRUSTEE, OF PITTSBURGH, PENNSYL- VANIA, .A CORPORATION OF PENNSYLVANIA.

RLEvEnsING TURBINE.

Specification of Letters Patent. I Patented Man 25, 1913, -Appllt'attxloii filed July 23, 1910. Serial No. 573,401. i

To all whom it may concern:

Be it known. that 1,.Hnnnnar T. HERR, a citizen of the United States, and a resident of'Pittsburgh, in the county of Allegheny. and State ofPennsylvania, have made a- An object of my invention is to producea reversing turbine provided with an improved form of rotor element which may be.

built up from standardparts. 'A further object is to produce 'a. turblne in which improved means are employed for balancing the longitudinal thrust on the retor element.

These and other objects attain by means the features hereinof a turbine embodying described and illustrated.

In the drawings accompanying this application and forming a part thereof, I have illustrated, in longitudinal section, a turbine embodying my invention. A portion of the.

turbine casing is shown broken away for the convenience of illustration.

The turbine, illustrated as an embodiment of my invention, includes an ahead portion and a reversing portion, both of which are inclosed within a cylinder or casing 3, which, in accordance with the usual practice, is divided on a horizontal plane passing through the axis of the turbine shaft. The ahead portion of the turbine consists of-a primary stage or. section 4 and a secondary stage or section 5. The primary stage shown, is an impulse stage and the secondary stage is an impulse and reaction, or a so called Parsons stage. The reversing portion shown, comprises a single impulse stage 6', which is located adjacent to the impulse stage of the ahead portion.

The-interior of the casing is divided by means of partitions or diaphragms 7,1ocated between the ahead and, the reverse portions,

' and a fluid seal 8, located between the partitions and the rotorv element of the turbine. A ring section 9 is located bet-ween the ahead and reversing portions'andis provided with oppositely discharging passages 10 and 11 which are adapted to deliver motive fluid to the ahead and reversing portions respectively. The ring section may be formedfin any convenient numberof. parts, and is secured to the turbine casing. Each fluid passage of the ringsection communicates with a fluid port provided in the casing which in turn communicates with a source'of motive .fiuid through suitably arranged piping, not

shown.

The primary stageofthe 'aheadportion of'the turbine is provided with two annular rows of blades 12 mounted on awheel 13.

and which receive motive fluid from expantion nozzles 15 communicating with the'passages 10. Each nozzle 15 is adapted to par-' tially expand the motive fluid and to deliver it to the first row of'blades 12. The motive fluid discharged from the first row of blades,

is re-directed byvanes 16, located between i the two rows'of blades 12, and is delivered to the second row of blades. The vanes 16" maybe mounted, as illustrated, [in a base piece 17 which is secured by bolts-or any other suitable means to the ring section 9..-

This stage consists of alternate Y mounted onthe casing and rotor element re'-' spectively. The motive fluid discharged from the final row of blades 18 is conducted to the exhaust or to a condenser by an exhaust passage 19 provided "in-the turbine casing.

The impulse section of the reversing portion is provided withtwo rows of blades 21 which are mounted on a wheel 22 of the rotor element. The initial row of blades 21 receives motive fluid from expansion noz-. 'zles 23, which communicate with the passages 11 and which expand the fluid to exhaust pressure. vanes 24 are located between the two rows of blades 21 andare.

mounted on the ring section 17 in a manner similar to that described with refer-- ence: to vanes 16. The motive fluid discharged from the final rowof blades 21 is delivered to an exhaust passage 25,wh ich is formed in the casing '3 and which preif erably communicates with the same exhaust or the same condenser as the exhaust passage 1'9. x V

The wheels 13 and 22 are formed inte- "grally with a cylinder oiquill 26 and are located on opposite sides of grooves or ridges 27 formed in the peripheral face of the quill 26; These grooves or ridges cogrally with a shaft- 32, and the other end is secured to a rotor element 33 on which the moving blades 18, of the secondary sta e 5 are mounted. The element'33 is integrally formed with a shaft 34. It will be seen from this arrangement that the cap 31 may be replaced by a rotor element similar to the rotor element 33 and that various modifications may be made in the make up of the turbine rotor without the necessity of varying the construction of the quill 26. The

' shafts 32 and 34 project through suitable packings formed in the ends of the casing and are adapted tobe journaled in suitable bearings located exteriorto the casing. v In the turbine illustrated, the impulse sections 4 and 6 do not impart a longitu dinalthrust to the turbine rotor, but the secondary stage 5 does induce a longitudinal thrust which must be counterbalanced. While the ahead portion of the turbine is receiving motive fluid, the reversing'portion is exposed to exhaust pressure; consequently, I proportion the diameter of the fluid seal 8 so that the fluid pressure in the ahead portion of the turbine, acting on the quill 26 in the direction of the reversing portion, counterbalances the longitudinal thrust. of

the'stage 5. While motive fluid is being admitted to the reversing portion of the turbine, the ahead portion is subjected to ex-- the ahead portion.

haust pressure, and consequently the turbine will be balanced, since the nozzles 23 expand the fluid to exhaust pressure and the same pressures exist on both sides of the fluid seal 8. It will be apparent that the quill 26 will be capable of balancingthe rotor element under such conditions even. though the. reversing portion is provided with a stage or section corresponding to the st'age 5 of The quill 26 is, in efl'ect, a balanced piston which is capable of balancing the pressures on the rotor element for all loads on the turbine whether the turbine is running ahead or reversing.

What I claim is:

1. A turbine rotor comprising a bi-laterally symmetrical cylinder provided with in'-' tegrally formed blade-mounting elements, and interchangeable end pieces secured to said cylinder.

2. A turbine rotor comprising a bi-laterally symmetrical balance piston provided with blade mounting elements, and interchangeable elements secured to said piston. 3. A turbine rotor comprising a balance piston provided with integrally formed blade-carrying elements, and cooperati -rotor elements secured to each end of sai piston.- v

4. A turbine rotor comprising a balance piston, a blade mounting element on said piston, and rotor elements provided with integrally formed shaft-s secured to each end of said piston. 1

5. In combination in a turbine, a bi-laterally symmetrical balance piston, rovided .with two blade carrying wheels, a uid seal locatedbetween said wheels, and interchangeable rotor elements secured to said piston.

In'testimony whereof, I have hereunto subscribed my name this 21st day of July, 1910. v

HERBERT T.-HERR. Witnesses .C. W. MCG'HEE, JNo. S. GRnEN.

Copies of this patent may be obtained for 'five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

